Is there any reason not to have zero deck height?
- seanyb505
- Donator
- Posts: 447
- Joined: February 16th, 2008, 9:34 am
- Stroker Displacement: 280ci
- Vehicle Year: 1997
- Vehicle Make: Jeep
- Vehicle Model: Cherokee
- Location: West Palm Beach Florida
Is there any reason not to have zero deck height?
For some reason when I started researching I got the idea it wasnt that great of an idea to deck the block that much. Now Im seeing a couple people actually shoot for zero deck height. Is there anything wrong with taking .0495 off the block?
Now I can be like all those other awesome people with more than one Jeep in their sig, but now I have to say one of them is sold:(
97 XJ 4.6
90 MJ 4.0 - sold
I want to have as many Jeeps as children. DD, offroader, drag MJ and another one. 4=4
97 XJ 4.6
90 MJ 4.0 - sold
I want to have as many Jeeps as children. DD, offroader, drag MJ and another one. 4=4
-
- My keyboard is getting warn out
- Posts: 1032
- Joined: February 28th, 2008, 3:13 am
- Stroker Displacement: 4.9
- Location: Michigan
Re: Is there any reason not to have zero deck height?
A loaded question with many variables. Taken at face value the only thing that would change is your valve train geometry. Length of the cylinder head bolts is another question. Though I suspect there is enough latitude here.
93 4.0 block
12 weight 4.2 crank
.080 Diamond pistons
Eagle rods
balanced
274/480 Cam
Mopar rollers with Engel springs
.043 Quench @ 9.48 Compression
Ported head
01 intake with 64 mm TB
Edlebrock header
Misc other stuff
Don`t need a Hemi.
12 weight 4.2 crank
.080 Diamond pistons
Eagle rods
balanced
274/480 Cam
Mopar rollers with Engel springs
.043 Quench @ 9.48 Compression
Ported head
01 intake with 64 mm TB
Edlebrock header
Misc other stuff
Don`t need a Hemi.
- Flash
- I love JeepStrokers.com!!
- Posts: 693
- Joined: February 17th, 2008, 10:45 pm
Re: Is there any reason not to have zero deck height?
No problem at all just as long as you quench is at least .045 your safe.( .002" below deck and and a .043 head gasket = .045"
The reason some don't deck the block, or don't thing is a good idea, is those that will spend the extra cash for the custom piston.
If the piston set up further in the bore it will stop sooner at the bottom(More piston skirt supported at BDC (Bottom Dead Center)
for those of us, that will be using stock 4.0L piston..........Decking the block will make "0" affect on this.
Flash.
The reason some don't deck the block, or don't thing is a good idea, is those that will spend the extra cash for the custom piston.
If the piston set up further in the bore it will stop sooner at the bottom(More piston skirt supported at BDC (Bottom Dead Center)
for those of us, that will be using stock 4.0L piston..........Decking the block will make "0" affect on this.
Flash.
89 XJ with 300,000 on the original eng
"I've also never completed a motor, yet. My mouth (fingers) is also writing checks my ass can't cash."
"I've also never completed a motor, yet. My mouth (fingers) is also writing checks my ass can't cash."
- Flash
- I love JeepStrokers.com!!
- Posts: 693
- Joined: February 17th, 2008, 10:45 pm
Re: Is there any reason not to have zero deck height?
Good point, I hadn't even thought about the head bolt and yes if you deck more then a several thousands of the deck.......You will be buying shorter push rods or shimming the rocker arms for proper preload at the lifter.jsawduste wrote:A loaded question with many variables. Taken at face value the only thing that would change is your valve train geometry. Length of the cylinder head bolts is another question. Though I suspect there is enough latitude here.
Flash.
89 XJ with 300,000 on the original eng
"I've also never completed a motor, yet. My mouth (fingers) is also writing checks my ass can't cash."
"I've also never completed a motor, yet. My mouth (fingers) is also writing checks my ass can't cash."
-
- My keyboard is getting warn out
- Posts: 1032
- Joined: February 28th, 2008, 3:13 am
- Stroker Displacement: 4.9
- Location: Michigan
Re: Is there any reason not to have zero deck height?
Flash, please don`t travel down the road of shimming stock rocker arms.
93 4.0 block
12 weight 4.2 crank
.080 Diamond pistons
Eagle rods
balanced
274/480 Cam
Mopar rollers with Engel springs
.043 Quench @ 9.48 Compression
Ported head
01 intake with 64 mm TB
Edlebrock header
Misc other stuff
Don`t need a Hemi.
12 weight 4.2 crank
.080 Diamond pistons
Eagle rods
balanced
274/480 Cam
Mopar rollers with Engel springs
.043 Quench @ 9.48 Compression
Ported head
01 intake with 64 mm TB
Edlebrock header
Misc other stuff
Don`t need a Hemi.
- seanyb505
- Donator
- Posts: 447
- Joined: February 16th, 2008, 9:34 am
- Stroker Displacement: 280ci
- Vehicle Year: 1997
- Vehicle Make: Jeep
- Vehicle Model: Cherokee
- Location: West Palm Beach Florida
Re: Is there any reason not to have zero deck height?
I knew about the valvetrain....my shim kit actually arrived yesterday. Even if I go to zero deck Im still sitting pretty at 9.23 CR. Would bolts have to be altered? Ill be using the 258 rods, so zero deck can be acheived by decking the block .0495", I just didnt know if it was safe or not.
Now I can be like all those other awesome people with more than one Jeep in their sig, but now I have to say one of them is sold:(
97 XJ 4.6
90 MJ 4.0 - sold
I want to have as many Jeeps as children. DD, offroader, drag MJ and another one. 4=4
97 XJ 4.6
90 MJ 4.0 - sold
I want to have as many Jeeps as children. DD, offroader, drag MJ and another one. 4=4
- Flash
- I love JeepStrokers.com!!
- Posts: 693
- Joined: February 17th, 2008, 10:45 pm
Re: Is there any reason not to have zero deck height?
seanyb505 wrote:I knew about the valvetrain....my shim kit actually arrived yesterday. Even if I go to zero deck Im still sitting pretty at 9.23 CR. Would bolts have to be altered? Ill be using the 258 rods, so zero deck can be acheived by decking the block .0495", I just didnt know if it was safe or not.
I Don't know?????? ask you machines and let us know what he recommends, or how much you can get a way with before shorter bolts are needed??????
Hmmm i have never heard of any one talking about shortening or replacing with shorter bolts????????
A some point this could be important.
Here's another question.........How thick is the deck?????
Flash.
89 XJ with 300,000 on the original eng
"I've also never completed a motor, yet. My mouth (fingers) is also writing checks my ass can't cash."
"I've also never completed a motor, yet. My mouth (fingers) is also writing checks my ass can't cash."
- seanyb505
- Donator
- Posts: 447
- Joined: February 16th, 2008, 9:34 am
- Stroker Displacement: 280ci
- Vehicle Year: 1997
- Vehicle Make: Jeep
- Vehicle Model: Cherokee
- Location: West Palm Beach Florida
Re: Is there any reason not to have zero deck height?
Im going off of what is listed on the stroker calculator for deck height, which I dont have on this computer so I dont know off the top of my head.
Now I can be like all those other awesome people with more than one Jeep in their sig, but now I have to say one of them is sold:(
97 XJ 4.6
90 MJ 4.0 - sold
I want to have as many Jeeps as children. DD, offroader, drag MJ and another one. 4=4
97 XJ 4.6
90 MJ 4.0 - sold
I want to have as many Jeeps as children. DD, offroader, drag MJ and another one. 4=4
- Shark
- Consistent
- Posts: 268
- Joined: February 14th, 2008, 8:51 pm
- Location: Tampa Bay
Re: Is there any reason not to have zero deck height?
shorter head bolts shouldnt be a big deal. just take a chop saw and cut off the machined deck height. grind down the rough edges. the stock bolts are plenty long. dont think there would be a problem with losing too much of their strength.
'91 MJ 4.0 ax15 Resto-mod street truck project, stroker candidate
'93 XJ 2door 4.0 aw4 np231 7" lift 33's
'95 XJ 4door 4.0 aw4 2" 31's
'95 XJ 4door 4.0 aw4 np231 4" lift 31's RIP
'93 XJ 2door 4.0 aw4 np231 7" lift 33's
'95 XJ 4door 4.0 aw4 2" 31's
'95 XJ 4door 4.0 aw4 np231 4" lift 31's RIP
-
- I think I'll order a "tab"
- Posts: 46
- Joined: February 14th, 2008, 10:39 am
- Stroker Displacement: 4.6
- Vehicle Year: 1997
- Vehicle Make: Jeep
- Vehicle Model: Cherokee
Re: Is there any reason not to have zero deck height?
What is wrong with using shims? I was planning on using these to compensate for decking the block 0.040 +/-:jsawduste wrote:Flash, please don`t travel down the road of shimming stock rocker arms.
http://store.summitracing.com/partdetai ... toview=sku
Says they work with the 242. I'd like to not go with custom pushrods, but if shims are bad news, then I'll have to reconsider.
-Andy
'97 XJ 4.6L Stroker
'00 Explorer
'67 Mustang Fastback (project)
'97 XJ 4.6L Stroker
'00 Explorer
'67 Mustang Fastback (project)
- seanyb505
- Donator
- Posts: 447
- Joined: February 16th, 2008, 9:34 am
- Stroker Displacement: 280ci
- Vehicle Year: 1997
- Vehicle Make: Jeep
- Vehicle Model: Cherokee
- Location: West Palm Beach Florida
Re: Is there any reason not to have zero deck height?
I was poking around the hesco site the other day and the have different length pushrods for around 40 a set. What are the lengths of the stock rods?
Now I can be like all those other awesome people with more than one Jeep in their sig, but now I have to say one of them is sold:(
97 XJ 4.6
90 MJ 4.0 - sold
I want to have as many Jeeps as children. DD, offroader, drag MJ and another one. 4=4
97 XJ 4.6
90 MJ 4.0 - sold
I want to have as many Jeeps as children. DD, offroader, drag MJ and another one. 4=4
-
- I think I'll order a "tab"
- Posts: 46
- Joined: February 14th, 2008, 10:39 am
- Stroker Displacement: 4.6
- Vehicle Year: 1997
- Vehicle Make: Jeep
- Vehicle Model: Cherokee
Re: Is there any reason not to have zero deck height?
My FSM says 9.640" - 9.660", 5/16" diameterseanyb505 wrote:I was poking around the hesco site the other day and the have different length pushrods for around 40 a set. What are the lengths of the stock rods?
-Andy
'97 XJ 4.6L Stroker
'00 Explorer
'67 Mustang Fastback (project)
'97 XJ 4.6L Stroker
'00 Explorer
'67 Mustang Fastback (project)
- seanyb505
- Donator
- Posts: 447
- Joined: February 16th, 2008, 9:34 am
- Stroker Displacement: 280ci
- Vehicle Year: 1997
- Vehicle Make: Jeep
- Vehicle Model: Cherokee
- Location: West Palm Beach Florida
Re: Is there any reason not to have zero deck height?
The ones I would see being most relevant are 9.5" and 9.547", and you would need to take .093" off the head and block combined to make the most use out of the 9.547" rods. Thats a lot to take off, it looks like if I were to go to zero deck and take .015 from the head the shortest I could go with would be 9.575". I dont need to go to zero deck, so by taking .045 from the block and .015 from the head I would only need a .060 shim for each rocker, and since I have that exact size I think Im ok. But now with the production of the KB pistons which can use the 4.0 rod, Ill have to see which direction regarding zero deck height I take based on price.
Now I can be like all those other awesome people with more than one Jeep in their sig, but now I have to say one of them is sold:(
97 XJ 4.6
90 MJ 4.0 - sold
I want to have as many Jeeps as children. DD, offroader, drag MJ and another one. 4=4
97 XJ 4.6
90 MJ 4.0 - sold
I want to have as many Jeeps as children. DD, offroader, drag MJ and another one. 4=4
-
- Consistent
- Posts: 217
- Joined: March 8th, 2008, 5:34 am
- Stroker Displacement: 280
Re: Is there any reason not to have zero deck height?
I have in the past decked over .090 on a HIGH [14+] comp motor without issue. Adjust push rod lenght as needed.
- seanyb505
- Donator
- Posts: 447
- Joined: February 16th, 2008, 9:34 am
- Stroker Displacement: 280ci
- Vehicle Year: 1997
- Vehicle Make: Jeep
- Vehicle Model: Cherokee
- Location: West Palm Beach Florida
Re: Is there any reason not to have zero deck height?
Im sure its possible; I was referring to my particular build.
Now I can be like all those other awesome people with more than one Jeep in their sig, but now I have to say one of them is sold:(
97 XJ 4.6
90 MJ 4.0 - sold
I want to have as many Jeeps as children. DD, offroader, drag MJ and another one. 4=4
97 XJ 4.6
90 MJ 4.0 - sold
I want to have as many Jeeps as children. DD, offroader, drag MJ and another one. 4=4
Who is online
Users browsing this forum: No registered users and 3 guests